gnutls_x509_crt_set_key_purpose_oid - Sets the Certificate’s key
int gnutls_x509_crt_set_key_purpose_oid(gnutls_x509_crt_t cert, const
void * oid, unsigned int critical);
a certificate of type gnutls_x509_crt_t
const void * oid
a pointer to a null terminated string that holds the OID
unsigned int critical
Whether this extension will be critical or not
This function will set the key purpose OIDs of the Certificate. These
are stored in the Extended Key Usage extension (22.214.171.124) See the
GNUTLS_KP_* definitions for human readable names.
Subsequent calls to this function will append OIDs to the OID list.
On success, GNUTLS_E_SUCCESS (zero) is returned, otherwise an error
code is returned.
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